Run "flashall". When "Please plug and reboot the board" appears, disconnect the A (or middle) USB port and the barrel connector for the power. At this point everything is switched off. Then reconnect A and the barrel connector to reboot the board.Wait about 5 minutes for the rest of the process to run automatically.

before i performing what you mentioned, i tried to login edison using putty via serial comm as i mentioned in my question it doesn't work as before and also the edison board heats up and making disconnect.

and make sure you use the USB port from the top for serial communication.If you have a Windows host machine you should see USB Serial port COMx (x being the number of the port) in Device manager. You can use that port in Putty and set the speed to 115200.